// Copyright 2012 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef CC_LAYERS_DRAW_PROPERTIES_H_ #define CC_LAYERS_DRAW_PROPERTIES_H_ #include "base/memory/scoped_ptr.h" #include "ui/gfx/rect.h" #include "ui/gfx/transform.h" namespace cc { // Container for properties that layers need to compute before they can be // drawn. template <typename LayerType> struct CC_EXPORT DrawProperties { DrawProperties() : opacity(0.f), opacity_is_animating(false), screen_space_opacity_is_animating(false), target_space_transform_is_animating(false), screen_space_transform_is_animating(false), can_use_lcd_text(false), is_clipped(false), render_target(NULL), contents_scale_x(1.f), contents_scale_y(1.f), num_descendants_that_draw_content(0), num_unclipped_descendants(0), layer_or_descendant_has_copy_request(false), has_child_with_a_scroll_parent(false), sorted_for_recursion(false), index_of_first_descendants_addition(0), num_descendants_added(0), index_of_first_render_surface_layer_list_addition(0), num_render_surfaces_added(0) {} // Transforms objects from content space to target surface space, where // this layer would be drawn. gfx::Transform target_space_transform; // Transforms objects from content space to screen space (viewport space). gfx::Transform screen_space_transform; // DrawProperties::opacity may be different than LayerType::opacity, // particularly in the case when a RenderSurface re-parents the layer's // opacity, or when opacity is compounded by the hierarchy. float opacity; // xxx_is_animating flags are used to indicate whether the DrawProperties // are actually meaningful on the main thread. When the properties are // animating, the main thread may not have the same values that are used // to draw. bool opacity_is_animating; bool screen_space_opacity_is_animating; bool target_space_transform_is_animating; bool screen_space_transform_is_animating; // True if the layer can use LCD text. bool can_use_lcd_text; // True if the layer needs to be clipped by clip_rect. bool is_clipped; // The layer whose coordinate space this layer draws into. This can be // either the same layer (draw_properties_.render_target == this) or an // ancestor of this layer. LayerType* render_target; // The surface that this layer and its subtree would contribute to. scoped_ptr<typename LayerType::RenderSurfaceType> render_surface; // This rect is in the layer's content space. gfx::Rect visible_content_rect; // In target surface space, the rect that encloses the clipped, drawable // content of the layer. gfx::Rect drawable_content_rect; // In target surface space, the original rect that clipped this layer. This // value is used to avoid unnecessarily changing GL scissor state. gfx::Rect clip_rect; // The scale used to move between layer space and content space, and bounds // of the space. One is always a function of the other, but which one // depends on the layer type. For picture layers, this is an ideal scale, // and not always the one used. float contents_scale_x; float contents_scale_y; gfx::Size content_bounds; // Does not include this layer itself, only its children and descendants. int num_descendants_that_draw_content; // Number of descendants with a clip parent that is our ancestor. NB - this // does not include our clip children because they are clipped by us. int num_unclipped_descendants; // If true, the layer or some layer in its sub-tree has a CopyOutputRequest // present on it. bool layer_or_descendant_has_copy_request; // This is true if the layer has any direct child that has a scroll parent. // This layer will not be the scroll parent in this case. This information // lets us avoid work in CalculateDrawPropertiesInternal -- if none of our // children have scroll parents, we will not need to recur out of order. bool has_child_with_a_scroll_parent; // This is true if the order (wrt to its siblings in the tree) in which the // layer will be visited while computing draw properties has been determined. bool sorted_for_recursion; // If this layer is visited out of order, its contribution to the descendant // and render surface layer lists will be put aside in a temporary list. // These values will allow for an efficient reordering of these additions. size_t index_of_first_descendants_addition; size_t num_descendants_added; size_t index_of_first_render_surface_layer_list_addition; size_t num_render_surfaces_added; }; } // namespace cc #endif // CC_LAYERS_DRAW_PROPERTIES_H_